Don't store document-specific rotation when sticky rotation is enabled (#6423)
Don't store document-specific rotation when sticky rotation is enabled (#6423)

It doesn't do so for the FM, so the inconsistency is confusing.
Plus, if you're actively using sticky rotation, saved rotations are
ignored anyway.

Re #6420
poire-z/koreader,poire-z/koreader,pazos/koreader,Frenzie/koreader,NiLuJe/koreader,NiLuJe/koreader,Frenzie/koreader,mwoz123/koreader,koreader/koreader,koreader/koreader,Markismus/koreader,Hzj-jie/koreader